Abstract: In order to evaluate the adverse impacts of port petrochemical industry on the marine eco-environment, theoretical system of environmental disaster and mathematical statistics were used to build an environmental risk assessment model, which was based on the eco-environment monitoring data of Liaodong Bay coastal waters in 2014-2018. The environmental risk assessment of the coastal waters in Liaodong Bay was carried out by using the technology of ArcGIS space vector superposition analysis technology. The results showed that the overall environmental risk carrying capacity of Liaodong Bay coastal waters was vulnerable, with the vulnerability increasing from open sea to the nearshore. At the same time, according to the environmental monitoring data in recent years, the eco-environmental status had a tendency to develop in an unfavorable direction. Meanwhile, the study sea area was in a medium risk situation as a whole, and approximately 17.6% of the coastal waters were at high risk, mainly distributed in the sea area from Shuangtaizi Estuary to Liaohe Estuary, with the distribution closely related to the position of port petrochemical industry and its transportation route. Therefore, it was suggested that the management departments should pay close attention to the high-risk areas, and establish a comprehensive management system for risk prevention and control, rapid emergency disposal and disaster prevention and reduction.